23505

Appears in sequences

• Number of partitions in parts not of the form 15k, 15k+3 or 15k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 6 are greater than 1.at n=43A035957
• a(0)=a(1)=1. For n >= 2, a(n) = a(n-2) + a(n-1) + (number of terms from among {a(0),a(1),a(2),...a(n-1)} which are <= n).at n=19A128610
• Number of binary strings of length n with no substrings equal to 0001 0101 or 1100.at n=17A164474
• a(n)=(n^4-n^3-n^2-n)/2.at n=15A171129
• a(0) = 0 and a(n) = (4*n^3 - 12*n^2 + 20*n - 9)/3 for n >= 1.at n=27A174794
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2>x^2+y^2.at n=45A211637
• Triangle read by rows: T(n,k), where n, k >= 2, is the number of n-element unlabeled connected series-parallel posets with k ordinal terms that are either the singleton or disconnected posets.at n=46A356558